Electromagnetically-controlled brake



B. E. FERNOW, JR-

ELECTROMAGNETICALLY CONTROLLED BRAKE.

APPLlCATION FILED MAR. 14, I917.

1,338,980. Patented May 4, 1920.

UNITED STATES PATENT OFFICE.

BERNARD E. FERNOW, 33. 01 MILWAUKEE, WISCONSIN, ASSIGNOR TO THE CUTLER- HAMMER MFG. 00., DIE MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

ELECTROMAGNETICALLY-CONTROLLED BRAKE.

Specification of Letters Patent.

Patented May 4, 1920.

Application filed March 14, 1917. Serial No. 154,821.

netically-Controlled Brakes, of which the following is a full, clear, concise, and ex-' act description, reference being had to the accompanying drawing, forming a part of this specification. This invention relates to electromagnet1- cally controlled brakes and the like, 'and though not limited thereto, is particularly applicable to devices of the multiple d1sk t e.

An object of the invention is to provide a mechanism for the aforesaid and other purposes which may be more readily and expeditiously adjusted, and the adjustment of which may be eifected without disassembling or disconnecting any portion thereof and without opposition by the energy 0 the spring or of the electromagnet employed.

Other objects and advantages W111 hereinafter appear.

Referring to the drawing, wherein is illustrated a preferred embodiment of the invention, Figure 1 is a side elevational view thereof, certain parts being shown in section; while j Fig. 2 is an end elevation of the casing. Referring to the drawing, the brake illustrated comprises in general a casing 1 having lugs 2 to be secured to a fixed support, a shaft 3 to be braked projecting wlthm said casing, and series of alternately arranged rotatable and non-rotatable friction disks 4, 5, the former being movable with the shaft and the latter hel by the caslng, a magnetic plate 6 adjacent said disks and biased to force the same into engagement by a spring 7 and a magnetic winding 8, adapted when energized to attract said plate and thereby relieve said disks of the pressure of said spring.

The disks 4 are arranged fof' rotation with the shaft 3 by means of a collar 9 keyed upon said shaft and having exteriorly located keyways 10 containing keys or feathers 11 which also engage within suitable loose keyways or recesses in said disks, whereby the latter are constrained to rotate with .the shaft but are free to reciprocate relatively thereto. The disks 5 are of larger diameter than said rotatable disks and are provided therebeyond with suitable openings 12 for loose mounting upon a ser1es of axially extending studs 13 which are fixed'within suitable head members 14, 15 of the casing. By the above construction the stationary disks are held against rotation relative to the casing but are permitted a limited reciprocation with respect thereto. In practice the engaging surfaces of the aforesaid disks are preferably lined with suitable wear resisting material and the first and last disks of the series are preferably non-rotatable.

The magnetic plate 6 is loosely mounted upon a serles of fixed axially extending studs 16 for reciprocation with respect to the casing, said plate having projecting portlons 17 adapted to engage the adjacent stationary disk 5 during braking action.

The spring 7 and the magnet winding 8, both of which act upon the plate 6, are carried within a suitable head member 18 of magnetic material, said member having a flange 19 to be inset within the outer ed e of the casing whereby the inner edge of t e spring, as well as the inner edge of the winding, are arranged adjacent the plate 6. The head member 18 being secured in place in the relation above described, the sprin 7 tends to force said plate toward an againstithe friction rings causing engagement and braking action thereof, the tension of said spring being regulable by suitable adjusting means 20 carried by said head.

For compensating the wear of the friction liners and the consequent lengthening of the air gap between the plate 6 and its winding,

an annular abutment member 21 is threaded pro said action serving further to restore the r adjustment of the spring 7.

e area of engagement between the abutment member and the disk 5 being reduced and the diameter of said member being also relatively small, it is apparent that the friction incident to turning thereof is minimized, whereby, when necessary, adjustment may be efiected even during engagement of the brake.

It is therefore obvious that the adjustment means aforedescribed is readily operable under all service conditions of the brake and without disassembling or disconnecting any portion thereof or disturbing ,an ermanent adjustment.

Viiat I claim as new and desire to secure by Letters Patent is:

1. In an electromagnetically controlled brake or .the like, in combination, a casing,

an electromagnet fixed thereto, a plurality of friction disks mounted within said casin an armature member to be attracted by said electromagnet also mounted within said casing, means biasing said armature member away from said electromagnet and against said disks for causing forcible engagement of the latter, and an adjustable stop member carried within a portion of said casin and extending therebeyond, said member eing movable for varying relation of said disks and said armature member to said electromagnet.

2. In an electromagnetically controlled brake or the like, in combination, a casing, an electromagnet rigidly secured therewithin, a plurality of friction disks and an armature member located within said casing, means normally acting upon said armature member for causin forcible en agement of said disks, said eIectromagnet eing effective for causing release of said disks by said armature and an adjustable stop member cooperatin with an inteiral portion of said casing an movable to s 1ft said disks 3. In an electromagnetically controlled brake or the like, in combination, a casing,

an elcctroma et fixed thereto, a plurality of friction disks mounted within said casing, an armature member for said electromagnet, a spring biasin said armature member away from said e ectromagnet and against said disks for causing forcible engagement of the latter, and an adjustable stop member for said disks movable to force the same toward said electromagnet for varying the play of said armature relative thereto and restoring the normal tension of said s ring.

4. 11 an electromagnetically controlle brake or the like in combination, a casing, an electromagnet rigidly secured therew thin, a plurality of friction disks carried within said casing, an armature for said electromagnet also contained within said casing, means biasing said electromagnet and said armature member apart and means carried by said casing and operable during attraction of said armature by said electroma etfor adjusting the play of the former witi respect to the latter when released therefrom.

5. In an electromagnetically controlled brake or .the like, in combination, a casing, an electromagnet rigidly secured therewithin, an armature member for said electromagnet, means biasing said armature away from said electroma net, disks subjected to the pressure 0 said armature member under its bias and an adjustable attachment cooperating with said casing and operable during attraction of said armature by said electromagnet for adjusting the biased play of the former with respect to the latter when released therefrom.

In witness whereof I have hereunto subscribed my name.

BERNARD E. FERNOW, JR. 

